Finding the Third Proportional to 20,400 and 42,104

Step by Step Solution

1. Step 1: Write the proportion equation
   20,400 : 42,104 = 42,104 : x
2. Step 2: Convert to fraction form
   20,400/42,104 = 42,104/x
3. Step 3: Cross multiply
   20,400x = 42,104 × 42,104
4. Step 4: Simplify right side
   20,400x = 1,772,746,816
5. Step 5: Solve for x
   x = 1,772,746,816/20,400
6. Step 6: Final answer
   x = 86,899.35